Microneedling Combined With Either Tranexamic Acid or PRP in Treatment of Pigmented Postacne Scars : A Split Face Comparative Study

Acne is a multifactorial chronic inflammatory disease of pilosebaceous unit, clinically characterised by the presence of comedones, inflammatory papules, pustules and sometimes nodules and cysts. It commonly occurs during adolescence and cause great psychological stress. Unfortunately, acne scarring is common and occurs easily in the course of the disease. It is one of the most common causes of facial scarring and treating acne scar is one of the most challenging cosmetic procedures . Patient with acne vulgaries is not only experience the primary inflammatory and non-inflammatory lesions, but also have secondary lesions such as scars, excoriations, post-inflammatory erythema, and dyspigmentation. Acne scars are pleomorphic and difficult to count or even photograph, and consensus concerning acne scar nomenclature and classification remains a matter of debate .

The pathophysiology driving acne scar development is attributed to an altered wound healing response initiated by cutaneous inflammation, leading to an imbalance in matrix degradation and collagen biosynthesis .

The ultimate severity is correlated with acne grade and delay in treatment of active disease . The end result is either an excess of collagen that manifests as hypertrophic/keloid scars or, more commonly, decreased collagen deposition that manifests as atrophic acne scars in 80 to 90 percent of cases.

Tranexamic acid (TXA); a plasmin inhibitor used to prevent fibrinolysis to reduce blood loss , is now gaining popularity as a depigmenting agent as it can block melanin synthesis in melanocytes by inhibiting plasmin-plasminogen system , as well as competitive-inhibition of tyrosinase activity due to its similarity to tyrosine structure .

Microneedling has been used to treat various dermatologic conditions, including scars, rhytides, and dyschromia . The treatment causes small channels of epidermal and dermal injury through the use of needles that puncture the skin . The damaged collagen is removed, and new growth and remodeling subsequently occur . The release of platelet-derived growth factors, fibroblasts, and elastic fiber formation contribute to neovascularization and neocollagenesis ..